Completely upgrade three weapons.

Respawn the Enderdragon.

Use a secret explosive weapon to kill 10 enemies. (Agony Bolt effects negate results)

I'm not taking any chances, this bus can't take much more damage. (Ch. 12)

Complete the game on Casual difficulty.

Kill 5 enemies with a torch.

I should get this whole generator panel running just in case. (Ch. 14)

Outrun a gigantic threat in the city.

Kill 200 enemies.

End a monstrosity in the underground garage.

Escape the Keeper beneath the catacombs.

Finish off a shrieking beast.

Kill 30 enemies.